NM Series Direct Coupled Actuator Minimum 70 in-lb torque Application Methods

NM Series Direct Coupled Actuator Minimum 70 in-lb torque Application Methods
NM Series Direct Coupled Actuator
®
Minimum 70 in-lb torque
●
For damper areas up to 18 sq-ft*
Application Methods
●
24 VAC
●
●
●
●
on-off/floating point
●
●
●†
●
●
●
●
modulating - 2 to 10 VDC
Multi-function**
Feedback:
●
2 to 10 VDC
VDC variable**
Running time:
75 to 150 sec for 0 to 70 in-lb
●
●
150 sec independent of load.
●
Adj. 75 to 300 sec***
●
5 sec. constant for 95°
External direction of rotation switch
●
●
●
●
Angle of rotation limiting (mechanical)
●
●
●
●
External manual override
●
●
●
●
Auxiliary switches ..............(p. 148)
General wiring ..................(p. 151)
Installation instructions ..(p. 149–153)
Start-up and checkout ..(p. 154)
*Based on 4 in-lb/ft2 damper torque loading. Parallel blade. No edge seals. **Default 2 to 10 VDC ***Default 150 seconds
† only VDC proportional control signal is available, and variable
138
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
Control signal:
(p. 14
6)
●
70 in-lb
35 in-lb
Power supply:
NMQ2
4-MFT
US
NM24
-MFT
US
●
NM Series – at a glance
Torque:
(p. 14
2)
NM24
-SR U
S
(p. 14
0)
Actuators
in bold have
BDCM
NM24
US
©
(p. 14
4)
Medium Volume Control Dampers.
®
NM Series Direct Coupled Actuator
A CLOSER LOOK…
LISTED
94D5
TEMP. IND &
REG. EQUIP.
UL

● Cut labor costs with simple direct coupling.
● Check damper position from a distance with
clear position indicator.
● Don’t worry about actuator burn-out.
Belimo is overload-proof throughout rotation.
● Enjoy added flexibility with easy mechanical
stop to adjust angle of rotation.
● Need to change control direction?
Do it easily with a simple switch.
NM
● Simple manual override button helps you get
up and running faster.
● Auxiliary switch accessory (SN1,SN2) is easy to
use, offers feedback or signal for additional device.
G20492-Subject to change. © Belimo Aircontrols (USA), Inc.
● 3 ft. plenum rated cable eases installation
Conduit connector provided: one less detail
to worry about.
● Microprocessor-controlled brushless DC motor increases
actuator life span and reliability, provides constant running
time independent of load. (Proportional actuators)
©
The Belimo Difference
● Customer Commitment.
Extensive product range. Application assistance.
Same-day shipments. Free technical support. Five year warranty.
● Low Installation and Life-Cycle Cost.
Easy installation. Accuracy and repeatability.
Low power consumption. No maintenance.
● Long Service Life.
Components tested before assembly. Every product tested before shipment.
30+ years direct coupled actuator design.
139
NM24 US
®
On-off, reversible, non-spring return, direct coupled, floating point, 24 V
Torque min. 70 in-lb, for control of air dampers
surfaces up to 18 sq. ft.
Application
For modulating or on-off control of dampers in HVAC systems. Actual actuator sizing should be done in accordance with the damper manufacturer’s specifications.
Control is on-off from an auxiliary contact of a fan motor
contactor, or a manual switch. The direction of rotation is
reversible, for use with a floating point type control. The
actuator mounts directly to the damper operating shaft with
a universal V-bolt clamp assembly.

Technical Data
Power supply
Power consumption
Transformer sizing
Electrical connection
Overload protection
Angle of rotation
Torque
Damper area (Note 1)
Direction of rotation
Position indication
Manual override
Running time
Humidity
Ambient temperature
Storage temperature
Housing
Housing material
Agency listings
Noise level
Servicing
Quality Standard
Weight
NM24 US
24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
running: 2 W; holding: 1W
3.5 VA (Class 2 power source)
3 FT, 18 GA plenum rated (UL CL2P)
1/2 in. conduit connector
electronic throughout 0 to 95° rotation
0 to 95°, adjust with mechanical stops
min 70 in-lb [8 Nm]
18 Sq Ft
reversible with switch L/R
clip-on indicator
button on actuator
75 to 150 sec for 0 to 75 in-lb [0 to 8Nm]
(0 to 90°)
5 to 95% RH, non-condensing
-4°F to +122°F [-20°C to +50°C]
-40°F to +176°F [-40°C to +80°C]
NEMA type 2
UL 94-5V (flammability rating)
UL 873 listed, CSA C22.2
No.24 certified, CE
less than 35 db (A)
maintenance free
ISO 9001
1.8 lbs [0.8 kg]
Note 1 Damper area is calculated using approximately 4 in-lb/sq ft of damper area. This
is an average torque requirement for good quality dampers operating under a 1"
WC pressure drop. Check damper specifications for exact torque requirements.
140
Accessories
AV 10-18 Damper shaft Extension
SN1,SN2 Auxiliary switches
ZG-H2
Actuator operator handle
ZG-NMSA-1 Short shaft adaptor
Note: When using NM24 US actuators, only use
accessories listed on this page.
Dimensions
3/8" to 3/4"
[9.5 – 20]
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
UL
[All numbers in brackets are in millimeters.]
7/8"
[22]
2 3/32"
[58]
3/8" to 5/8"
[9.5 – 16]
5 1/2" [140]
6 13/32'' [163]
1 1/16" [27]
5/32"
[9]
3 3/16"
[81]
7/32"
[5.2]
D016
LISTED
94D5
TEMP. IND &
REG. EQUIP.
Operation
The universal mounting bracket supplied with the actuator
will prevent lateral movement of the actuator. The damper
actuator is not provided with and does not require any limit
switches, but is protected against overloading. The angle
of rotation is mechanically limited to 95°. When reaching
the damper or actuator end position, the motor stops automatically. The gears can be manually disengaged by simply pressing down the spring loaded button on the actuator
cover. When this button is pressed down, the damper
blades can be adjusted by hand. The position of the actuator is indicated by a visual pointer.
Auxiliary switches are easily fastened directly onto the
actuator body for signalling and switching functions.
NM24 US
®
On-off, reversible, non-spring return, direct coupled, floating point, 24 V
1
3
2
Blk (1) Common –
Line
Volts
24 VAC Transformer
1
Red (2) +
2
3
Line
Volts
W120
24 VAC Transformer
W150
Wiring Diagrams
Blk (1) Common
Red (2) +
a
a open
a closed
Wht (3) +
Wht (3) +
The indication of direction
is valid for switch position R.
L
L
R
NM24 US
On-Off control of NM24 US
The indication of direction
is valid for switch position R.
R
NM24 US
Tri-State control of NM24 US
Notes:
Provide overload protection and disconnect as required.
2
Actuators are provided with color coded wires. Wire
numbers are provided for reference.
3
May also be powered by 24 VDC.
NM
1
Bulk packaging - NM24.1 US
G20492-Subject to change. © Belimo Aircontrols (USA), Inc.
The bulk packaging option for the NM… series
has been discontinued as of October 2003
T-Type bracket
These are included in the single-actuator
packages.
Part # 11333 (1 piece)
L-Type bracket 21731
Part #: 12503-00001 (24 pieces)
(includes 21731) shipped
separately upon request.
NM24 US - Typical Specification:
Control damper actuators shall be electronic direct coupled type
which require no crank arm and linkage. Actuators shall be UL
and CSA listed, have a 5 year warranty, and be manufactured
under ISO 9001 International Quality Control Standards.
Actuators shall have reversing switch and manual override
on the cover, and be protected from overload at all angles
of rotation. Actuators shall be as manufactured by Belimo.
141
®
NM24-SR US
Proportional damper actuator, non-spring return, direct coupled,
24 V, for 2 to 10 VDC and 4 to 20 mA control signal
Torque min. 70 in-lb, for control of air dampers
surfaces up to 18 sq. ft.
Application
For proportional modulation of dampers in HVAC systems. Actual actuator sizing should be done in accordance with the damper manufacturer’s specifications.
The actuator mounts directly to the damper operating
shaft with a universal V-bolt clamp assembly.
UL

Technical Data
Power supply
NM24-SR US
24 VAC, ± 20%, 50/60 Hz
Power consumption
Transformer sizing
Operating range Y
Input impedance
Feedback output 'U'
Electrical connection
running: 1.3 W; holding: 0.5W
3.5 VA (Class 2 power source)
2 to 10 VDC, 4 to 20 mA
100kΩ (0.1 mA), 500Ω
2 to 10 VDC, 0.7 mA max
3 ft, 18 GA plenum rated (UL CL2P) cable,
1/2” conduit connector
electronic throughout 0 to 95° rotation
min 70 in-lb (8 Nm)
18 sq ft
reversible with Switch L/R
L = CW with an increase in voltage
R = CCW with an increase in voltage
clip on indicator
button on actuator
0 to 95°, adjust with mechanical stops
150 seconds independent of max. angle of
rotation or torque
0 to 150 seconds proportional to max. angle
of rotation (Note 3)
± 5%
5 to 95% RH, non-condensing
-4 to +122° F (-20 to +50° C)
-40 to +176° F (-40 to +80° C)
not sensitive to position
NEMA 2
UL 94-5V (flammability rating)
less than 35 dB (A)
UL 873 listed, CSA C22.2
No.24 certified, CE
ISO 9001
maintenance free
1.8 lbs. (0.8kg.)
Overload protection
Torque (Note 1)
Damper area (Note 2)
Direction of rotation
Position indication
Manual override
Angle of rotation
Running time (35-95°)
Running time (0-35°)
Run time stability
Humidity
Ambient temperature
Storage temperature
Mounting position
Housing
Housing material
Noise level
Agency listings
Quality standard
Servicing
Weight
24 VDC, ±10%
Note 1 Minimum torque is produced at minimum voltage, minimum temperature.
Note 2 Damper area is calculated using approximately 4 in-lb/sq ft of damper area. This
is an average torque requirement for good quality dampers operating under a 1"
WC pressure drop. Check damper specifications for exact torque requirements.
Note 3 The on board microprocessor measures the actuators full stoke on startup.
It then adjusts the actuator speed to ensure 150 second run time for 35°-95°.
Below 35° stroke, the speed is constant and run time varies with rotation angle.
142
Operation
The actuator operates in response to a 2 to 10 VDC, 2 to
10 V phasecut or, with the addition of a 500Ω resistor, a
4 to 20 mA control input from an electronic controller or
positioner. A 2 to 10 VDC feedback signal is provided
for position indication or master-slave applications.
A built-in microprocessor automatically tests for the
amount of rotation required to modulate the damper fully
closed to fully open. The actuator will self-adjust to run
at a consistent running time of 150 seconds, and rescale
the input signal so the entire 8 volt control range is used
to provide maximum resolution of the control system.
The microprocessor will also correct for compression of
tight close-off gaskets with age, providing the actuator is
not on its mechanical stops. A functional test of the actuator-damper assembly may be done by pressing in the
manual override button, this will activate the actuators
test mode and cycle the actuator fully open and closed.
A 2 to 10 VDC feedback (U) is provided with full 8 volt
output range proportional to the operational rotation of
the damper.
A digital rotation sensing circuit protects the actuator in a
stall anywhere in its 95° working range without the need
of limit switches.
Auxiliary switches are easily fastened directly onto the
actuator body for signalling and switching functions.
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
LISTED
94D5
TEMP. IND &
REG. EQUIP.
Accessories
AV 10-18 Damper shaft extension
SN1,SN2 Auxiliary switches
ZG-H2
Actuator operator handle
ZG-NMSA-1Shaft adaptor for short shafts
Note: When using NM24-SR US actuators, only use
accessories listed on this page.
Dimensions
3/8" to 3/4"
[9.5 – 20]
[All numbers in brackets are in millimeters.]
7/8"
[22]
2 3/32"
[58]
3/8" to 5/8"
[9.5 – 16]
5 1/2" [140]
6 13/32'' [163]
1 1/16" [27]
5/32"
[9]
3 3/16"
[81]
7/32"
[5.2]
D016
©
®
NM24-SR US
Proportional damper actuator, non-spring return, direct coupled,
24 V, for 2 to 10 VDC and 4 to 20 mA control signal
24 VAC Transformer
1
4
Blk
Line
Volts
1
2
(1)
Common
Red (2)
W095
W094
Wiring diagrams
24 VAC Transformer
Blk (1) Common
Line
Volts
+ Hot
Ω
2 to 10 VDC (–)
Control Signal (+)
(–)
4 to 20 mA
Control Signal (+)
Wht (3) Y 2 to 10V Input
Grn (4) U 2 to 10V Output
L
2 to 10 VDC (–)
Feedback Signal (+)
R
NM24-SR US
2 to 10 VDC control of NM24-SR US
2
4
Red (2) + Hot
500Ω
5
Wht (3) Y 2 to 10V Input
Grn (4) U 2 to 10V Output
3
L
R
NM24-SR US
4 to 20 mA control of NM24-SR US with 2 to 10 VDC
feedback output
1
Provide overload protection and disconnect as required.
2
Actuators are provided with color coded wires. Wire
numbers are provided for reference.
3
Connect actuator common (Wire 1) to Negative (–) leg
of control circuits only.
4
May also be powered by 24 VDC.
5
The 500Ω resistor converts the 4 to 20 mA control
signal to 2 to 10 VDC.
Bulk packaging - NM24-SR.1 US
G20492-Subject to change. © Belimo Aircontrols (USA), Inc.
The bulk packaging option for the NM… series
has been discontinued since October 2003
T-Type bracket
These are included in the single-actuator
packages.
Part # 11533 (1 piece)
L-Type bracket 21731
Part #: 12503-00001 (24 pieces)
(includes 21731) shipped
separately upon request.
Typical Specification:
Control damper actuators shall be electronic direct coupled
type which require no crank arm and linkage. Actuators shall
be UL and CSA listed, have a 5 year warranty, and be manufactured under ISO 9001 International Quality Control
Standards. Actuators shall have reversing switch and gear
disengagement button on the cover, and be electronically protected from overload at all angles of rotation. Actuators shall
respond to 2 to 10VDC output relative to position regardless of
the amount of damper rotation. Actuators shall have brushless
DC motor. Run time shall be constant and independent of
torque and angular rotation between 35° and 95°. A 2 to 10
VDC feedback signal shall be provided for position indication
or master-slave applications. Actuators shall be as manufactured by Belimo.
143
NM
Notes:
®
NM24-MFT US
Proportional damper actuator, non-spring return, Multi-Function Technology®
• Torque min. 70 in-lb
• Control 2 to 10 VDC (DEFAULT)
• Feedback 2 to 10 VDC (DEFAULT)
Application
For proportional modulation of dampers in HVAC systems. The
NM24-MFT US is a non-spring return type actuator. When supply power is removed the actuator will maintain its last position.
NM24-MFT US

Technical Data
Power supply
NM24-MFT US
24 VAC, ± 20%, 50/60 Hz
24 VDC, ±10%
Power consumption running: 1.3W; holding: 0.5W
Transformer sizing 3.5 VA (Class 2 power source)
Electrical
3 ft, 18 GA, plenum cable,
connection
1/2” conduit connector
Overload protection electronic throughout 0 to 95° rotation
Operating range Y* 2 to 10 VDC, 4 to 20 mA
(w/500 Ω, 1/4 W resistor) ZG-R01
Input impedance
100kΩ for 2 to 10 VDC (0.1 mA)
500Ω for 4 to 20 mA
1500Ω for PWM, Floating point and
On-Off control
Feedback output U* 2 to 10 VDC, 0.5 mA max
Torque*
min 70 in-lb (8 Nm)
Direction of rotation* reversible with switch CW/CCW
CW=CW with decrease in signal
CCW=CCW with a decrease in signal
Angle of rotation*
0 to 95°, adjust with mechanical stops
Running time*
150 seconds constant
Angle of Rotation
Off (Default)
Adaptation*
Override control*
Min. (Min Position) = 0%
ZS (Mid. Position) = 50%
Max. (Max. Position) = 100%
Manual override
Manual push button
Position indication clip on indicator
Humidity
5 to 95% RH, non-condensing
Ambient temperature -4 to +122° F (-20 to +50° C)
Storage temperature -40 to +176° F (-40 to +80° C)
Housing
NEMA 2, IP54
Housing material
UL 94-5V (flammability rating)
Noise level
less than 35 dB (A)
Agency listings
UL 873 listed, CE, CSA C22.2
No .24 certified
Quality standard
ISO 9001
Servicing
maintenance free
Weight
1.8 lbs. (0.8kg.)
* Variable when configured with MFT options
144
These parameters can be changed by three means:
• Pre-set configurations from Belimo
• Custom configurations from Belimo
• Configurations set by the customer using the MFT-Handy®
or the MFT-Actuate™ PC software application.
Operation
The NM24-MFT US actuator provides 95° of rotation and is provided with a position indicator. The actuator will synchronize it’s
mechanical stop or the damper or valves mechanical stop and use
this point for its zero position during normal control operations.
The actuator uses a brushless DC motor which is controlled by
an Application Specific Integrated Circuit (ASIC) and a microprocessor. The microprocessor provides the intelligence to the
ASIC to provide a constant rotation rate and to know the actuator’s exact position. The ASIC monitors and controls the
brushless DC motor’s rotation and provides a Digital Rotation
Sensing (DRS) function to prevent damage to the actuator in a
stall condition. The position feedback signal is generated with
out the need for mechanical feedback potentiometers using
DRS. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches.
The NM24-MFT US is mounted directly to control shafts up to
3/4” diameter by means of its universal clamp and anti-rotation
bracket. The actuator provides constant torque to the application
with and without power applied to the actuator. The NM24-MFT
US actuator is shipped in a Mid position, compression against
seats or gaskets for tight shut-off is accomplished manually.
Dimensions
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
UL
[All numbers in brackets are in millimeters.]
3/8" to 3/4"
[9.5 – 20]
7/8"
[22]
2 3/32"
[58]
3/8" to 5/8"
[9.5 – 16]
5 1/2" [140]
6 13/32'' [163]
1 1/16" [27]
5/32"
[9]
3 3/16"
[81]
7/32"
[5.2]
D016
LISTED
94D5
TEMP. IND &
REG. EQUIP.
Default/Configuration
The default parameters for 2 to 10 VDC applications of the
NM24-MFT US actuator are assigned during manufacturing. If
necessary, custom versions of the actuators can be ordered.
The parameters noted in the Technical Data table are variable.
®
NM24-MFT US
Standard Wiring
W036
W035
Proportional damper actuator, non-spring return, Multi-Function Technology®
Standard Wiring
24 VAC Transformer
24 VAC Transformer
1
Line
Volts
1
Line
Volts
Blk (1) Common
Red (2) + Hot
3
3
3
Ω
Control Signal
4 to 20 mA
2
Control Signal (–)
2 to 10 VDC (+)
Blk (1) Common
Red (2) + Hot
3
2
(–)
(+)
Wht (3) Y1 Input, 2 to 10V
Wht (3) Y1 Input, 2 to 10V
2 to 10 VDC Feedback Signal
500Ω
1/4 watt
4
Grn (5) U Output, 2 to 10V
2 to 10 VDC Feedback Signal
Grn (5) U Output, 2 to 10V
CCW(L) CW(R)
CCW(L) CW(R)
Override to zero position
Override to zero position
24 VAC Transformer
24 VAC Transformer
1
Line
Volts
1
Line
Volts
Blk (1) Common
Red (2) + Hot
Blk (1) Common
Red (2) + Hot
Ω
3
500Ω
1/4 watt
Control Signal (–)
4 to 20 mA (+)
3
A 2
Control Signal (–)
2 to 10 VDC (+)
A Open = 0 V Position
A Closed = Normal Operation
Wht (3) Y1 Input, 2 to 10V
A
4
Wht (3) Y1 Input, 2 to 10V
2
A Open = 4 mA Position
A Closed = Normal Operation
Override to 20 mA position
Override to 10 V position
1
Line
Volts
24 VAC Transformer
1
Blk (1) Common
Line
Volts
B
Red (2) + Hot
Ω
B
500Ω
C
Control Signal (–)
4 to 20 mA
(+)
2
Wht (3) Y1 Input, 2 to 10V
Wht (3) Y1 Input, 2 to 10V
4
1/4 watt
C
B Closed = 20 mA Position
C Closed = Normal Operation
B Closed = 10 V Position
C Closed = Normal Operation
Override control to min, mid, max, positions
2
With a 4-20 mA Input, up to 4 actuators may
be wired in parallel. A 2% shift in the signal
is seen when using a 500Ω resistor. Power
consumption must be observed.
4 to 20 mA Control Signal
24 VAC Transformer
1
S1
Blk (1) Common
Line
Volts
4
S3
NO
SN1 US
C
NC
S2
S3
B
Ω
Control Signal (–)
2-10 VDC or (+)
500Ω
4 to 20 mA
S2
Red (2) + Hot
A
3
S1
NC
W037
G20492-Subject to change. © Belimo Aircontrols (USA), Inc.
Control Signal (–)
2 to 10 VDC
(+)
Blk (1) Common
3
Red (2) + Hot
3
NM
24 VAC Transformer
Wht (3) Y1 Input, 2 to 10V
S4
NO
NC
S5
S6
NO
1/4 watt
SN2 US
SN… Auxiliary Switches for NM24-MFT US
Functions
Min*
Mid*
Max*
Normal**
a
b
c
0%
50%
100%
Control mode acc. to Y
* Default selectable 0-100%. See Configuration Data Sheet.
** Customizable. See Configuration Data Sheet.
2 to 10 VDC Control Signal
Notes
1
Provide overload protection and disconnect as required.
2
Actuators may be connected in parallel if not mechanically
mounted to the same shaft. Power consumption and input
impedance must be observed.
3
Actuator may also be powered by 24 VDC.
4
ZG-R01 may be used.
145
NMQ24-MFT US
®
Fast acting, proportional damper actuator, non-spring return, Multi-Function Technology®
•
•
•
•
Torque min. 35 in-lb
Running time 5.0 to 8.0 seconds (5 sec. DEFAULT)
Control 2 to 10 VDC (DEFAULT)
Feedback 2 to 10 VDC (DEFAULT)
Application
For proportional modulation of dampers in HVAC systems with
fast running requirements, or some Laboratory fume hoods.
The NMQ24-MFT US is a non-spring return type actuator.
When supply power is removed the actuator will maintain its last
position.
LISTED
94D5
TEMP. IND &
REG. EQUIP.
UL

NMQ24-MFT US
Default/Configuration
The default parameters for 2 to 10 VDC applications of the
NMQ24-MFT US actuator are assigned during manufacturing.
If necessary, custom versions of the actuators can be ordered.
The parameters noted in the Technical Data table are variable.
These parameters can only be changed by pre-set configurations from Belimo.
146
Operation
The NMQ24-MFT US actuator provides 95° of rotation and is provided with a position indicator. Upon installation and wiring the
manual override push button must be pressed twice, so the actuator will perform an adaptation and use the new mechanical points
for zero position during normal control operations.
The actuator uses a brushless DC motor which is controlled by
an Application Specific Integrated Circuit (ASIC) and a microprocessor. The microprocessor provides the intelligence to the
ASIC to provide a constant rotation rate and to know the actuator’s exact position. The ASIC monitors and controls the
brushless DC motor’s rotation and provides a Digital Rotation
Sensing (DRS) function to prevent damage to the actuator in a
stall condition. The position feedback signal is generated with
out the need for mechanical feedback potentiometers using
DRS. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches.
Installation
The NMQ24-MFT US is mounted directly to control shafts up
to 3/4” diameter by means of its universal clamp and anti-rotation bracket. The actuator provides constant torque to the
application with and without power applied to the actuator. The
NMQ24-MFT US actuator is shipped in a Mid position, compression against seats or gaskets for tight shut-off is accomplished manually.
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
NMQ24-MFT US
24 VAC, ± 5%, 50/60 Hz
24 VDC, ± 5%
Power consumption running: 9 W; holding: 1.2 W
Transformer sizing 12 VA (Class 2 power source)
Electrical
3 ft, 18 GA, plenum cable,
connection
1/2” conduit connector
Overload protection electronic throughout 0 to 95° rotation
Operating range Y*† 2 to 10 VDC, 4 to 20 mA
(w/500 Ω, 1/4 W resistor) ZG-R01
Control resolution Response sensitivity, 80 mV
Reverse sensitivity, 80 mV
Sensitivity when driving off mechanical
position, 140 mV
Input impedance
100kΩ for 2 to 10 VDC (0.1 mA)
500Ω for 4 to 20 mA
Feedback output U* 2 to 10 VDC, 0.5 mA max
Torque*
min 35 in-lb (4 Nm)
Direction of rotation* reversible with switch L/R
L=CW with increase in signal
R=CCW with a increase in signal
Angle of rotation*
0 to 95°, adjust with mechanical stops
Running time*
5.0 seconds constant for 95° rotation
Angle of Rotation
On-manual (Default) when less
Adaptation*
than 95% angle
Manual override
Manual push button
Position indication clip on indicator
Humidity
5 to 95% RH, non-condensing
Ambient temperature -4 to +122° F (-20 to +50° C)
Storage temperature -40 to +176° F (-40 to +80° C)
Housing
NEMA 2, IP54
Housing material
UL 94-5VB (flammability rating)
Noise level
less than 52 dB (A)
Agency listings
UL 873 listed, CE, CSA C22.2
No .24 certified
Quality standard
ISO 9001
Servicing
maintenance free
Weight
1.8 lbs. (0.8kg.)
* Variable when configured with MFT options
† Only VDC proportional control signal is available, and
variable (eg: 0-10 VDC)
After mounting and completing electrical installation the
NMQ24-MFT US must have the adaptation function initiated.
This is accomplished by pressing the manual override consecutively two times within four seconds.
Dimensions [All numbers in brackets are in millimeters.]
3/8" to 3/4"
[9.5 – 20]
7/8"
[22]
2 3/32"
[58]
3/8" to 5/8"
[9.5 – 16]
5 1/2" [140]
6 13/32'' [163]
1 1/16" [27]
5/32"
[9]
3 3/16"
[81]
7/32"
[5.2]
D016
Technical Data
Power supply
NMQ24-MFT US
®
W171
W170
Fast acting, proportional damper actuator, non-spring return, Multi-Function Technology®
Standard Wiring - VDC
Override to zero position
24 VAC Transformer
24 VAC Transformer
1
Line
Volts
1
Blk (1) Common
Red (2) + Hot
Blk (1) Common
Line
Volts
3
Red (2) + Hot
3
Ω
3
2
Control Signal (–)
2 to 10 VDC (+)
Control Signal (–)
4 to 20 mA (+)
Wht (3) Y1 Input, 2 to 10V
2 to 10 VDC Feedback signal
2
Wht (3) Y1 Input, 2 to 10V
A
4
Grn (5) U Output, 2 to 10V
CCW
500Ω
1/4 watt
A Open = 4 mA Position
A Closed = Normal Operation
CW
NMQ24-MFT US
Standard Wiring - mA
Override to 100% position
24 VAC Transformer
24 VAC Transformer
1
Line
Volts
Blk (1) Common
Red (2) + Hot
3
Ω
500Ω
2
1/4 watt
Blk (1) Common
Red (2) + Hot
3
(–)
(+)
Control Signal
4 to 20 mA
3
4
500Ω
C
CW
1/4 watt
B Closed = 20 mA Position
C Closed = Normal Operation
NMQ24-MFT US
2
Wht (3) Y1 Input, 2 to 10V
4
Grn (5) U Output, 2 to 10V
CCW
B
Control Signal (–)
4 to 20 mA
(+)
Wht (3) Y1 Input, 2 to 10V
2 to 10 VDC Feedback signal
Ω
With a 4-20 mA Input, up to 4 actuators may
be wired in parallel. A 2% shift in the signal
is seen when using a 500Ω resistor. Power
consumption must be observed.
Override to open or closed position
2 to 10 VDC and 4 to 20 mA Control
Response sensitivity and reverse hysteresis, for VDC applications
G20492-Subject to change. © Belimo Aircontrols (USA), Inc.
Actuator responds to a 80 mV signal
when not changing direction.
Control
Direction
Actuator responds to a 80 mV signal when
reversing direction from stop position.
Satisfied
Control Position
80 mV
Minimum Reversed
Control Deadband
Minimum
Control
Resolution
80 mV
Satisfied
Control Position
Previous
Control
Direction
The reverse hysteresis away from
mechanical end position is 140mV
All listed mV values are converted to “degrees of rotation” for all other control modes.
Available configurations for the NMQ24-MFT US
Control
Position
feedback
Running
time
Torque
P-11001
2-10 VDC 2-10 VDC
5.0 sec
35 in-lbs
P-11002
0-10 VDC 0-10 VDC
5.0 sec
35 in-lbs
P-11003
2-10 VDC 2-10 VDC
6.0 sec
44 in-lbs
P-11004
2-10 VDC 2-10 VDC
7.0 sec
53 in-lbs
P-11005
2-10 VDC 2-10 VDC
8.0 sec
58 in-lbs
Configuration
Input
range
Motion
Run times available up to 60 sec. @ 58 in-lbs
Start point span adjustable control input is available. Please
consult Belimo for the proper configuration code.
PWM and Floating point control inputs are not available
with this actuator.
Notes
1
Provide overload protection and disconnect as required.
2
Actuators may be connected in parallel if not mechanically
mounted to the same shaft. Power consumption and input
impedance must be observed.
3
Actuator may also be powered by 24 VDC.
4
ZG-R01 may be used.
147
NM
1
Line
Volts
SN1, SN2 Auxiliary Switches
®
For the direct coupled actuator NM 2…
Operation
The SN1 and SN2 auxiliary switches are used to indicate
when a desired position of a damper is reached or to interface
additional controls for a specific control sequence. They are
modular units that mount directly onto the NM type actuators
and held in place with a prefitted screw. A driver disk is
attached to the actuator clamp and offers direct transmission
of the actuator position to the microswitch operating cams.
The switching points can be set over the full scale of 0 to 10
simply by adjusting the slotted discs.
NOTE: will not mount to NM actuators manufactured prior
to May 1994
Voltage
120
250
Resistive
6.0 A
6.0 A
Inductive
5.0 A
2.5 A
Wiring Diagrams
Technical Data
SN1
SN2
No. of switches
1xSPDT
2xSPDT
Switching capacity
6 A (2.5A) 250 VAC
S2
Switching point
S3
Electrical connection
adjustable over full actuator rotation
0 to 10. Pre-setting with scale possible.
3 ft. 18 GA cable [1 m long 0.75mm2]
Humidity
5 to 95% RH non-condensing
Ambient temperature
-22° F to +122° F [-30° C to +50° C]
Storage temperature
-40° F to +176° F [-40° C to +80° C]
Housing type
NEMA type 2
S1
S1
N.C.
NC
N.C.
●
●
●
S2
●
S3
●
NO
N.O.
●
N.O.
SN1
S4
N.C.
S5
●
S6
●
●
N.O.
SN2
Housing material rating UL 94-V0 (flammability rating)
4 oz [125 g]
5.6 oz [175 g]
Mounting Instructions
1. Remove pointer assembly from the actuator. Press down
the manual override button and rotate the actuator fully
counter-clockwise.
2. Invert SN . switch and turn the driver disk fully clockwise as
indicated.
3. Slide SN . switch onto actuator and check for the correct
mating of the driver disk to the universal clamp. Secure
with screw.
4. Adjust switch dials as necessary.
1
5. Remount the white plastic pointer only onto SN . switch.
2
148
3
4
5
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
Weight
Installation Instructions
®
Quick-Mount Visual Instructions for Mechanical Installation
mi
n.
1.5
” [3
8m
m]
T- bracket
L-bracket
1
NM
3/16"
3/16"
G20492-Subject to change. © Belimo Aircontrols (USA), Inc.
L-bracket
5°
T- bracket
2
3
QUICK-MOUNT VISUAL INSTRUCTIONS
1. Turn damper blades to their fully closed position. Slide
actuator onto damper shaft. Tighten the nuts on the universal clamp only finger-tight at this time.
2. Slide anti-rotation mounting strap up under actuator so that
it engages actuator at the center cut-out. Secure to ductwork with self-tapping screws.
3. Loosen nuts on clamp. Press manual override button.
Rotate the clamp to about 5° from the closed position (1/16
to 1/8" between stop and clamp). Tighten the two nuts on
the universal clamp with a 10 mm wrench using 4 to 6 ft-lb of
torque.
4. Adjust end stops, if required.
4
5. Mount actuator indoors. If mounted outdoors, use approved
protective enclosure.
149
Installation Instructions
®
Mechanical Installation
General Information
Preliminary steps
1. Belimo actuators should be mounted indoors in a dry, relatively clean environment free from corrosive fumes. If the actuator is
to be mounted outdoors, a protective enclosure must be used to shield the actuator.
2. For new construction work, order dampers with extended shafts. Instruct the installing contractor to allow space for mounting and
service of the Belimo actuator on the shaft. The damper shaft must extend at least 2" from the duct. If the shaft extends less than 2"
or if an obstruction blocks access, the shaft can be extended with the AV 10-18 shaft extension or the ZG NMSA-1 for applications
with minimal mounting area.
For replacement of existing gear train actuators, it is best to mount the actuator on the damper shaft.
Standard Mounting
The damper is now fully closed but the actuator is 5° from fully
closed. This is called “pre-loading” the actuator. When the
actuator is powered and sent to the closed position: it will put its
150
full torque on the shaft compressing the edge and blade seals.
This ensures that the damper will meet its leakage rating. The actuator is electronically protected from overload and will not be damaged.
Adjustable stops
The adjustable stops are needed when there is no damper stop
or if you want the damper to halt rotating before it reaches its
stops. The NM24. . actuator can be indefinitely stalled in any
position without harm.
1. Loosen the two end stops with a No. 2 Phillips head screwdriver being careful not to unscrew the captive nut under the slot.
2. Move the stops to the desired position and re-tighten the screws.
Manual override
The Belimo NM24. . actuators have a black, half round “manual
override button” located next to the cable entry. Press this button
and the gear train is disengaged so the damper shaft can be moved
manually. Release the button and the gear train is re-engaged.
Testing the installation without power
1. Disengage the gear train with the manual override button
and move the shaft from closed to open to closed. Ensure
that there is no binding and that the damper goes fully
open and closes with 5° of actuator stroke left.
2. Correct any problems and retest.
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
1. Remove the plastic position indicator from the actuator. Slip
the actuator's universal clamp over the damper shaft. Make
sure that the bottom of the actuator (metal side) is toward
the duct and the controls on the cover are accessible.
Place the actuator in the desired mounting position.
2. Turn the damper shaft until the blades are fully closed.
3. Hand tighten the two nuts on the NM24 . . universal clamp.
4. Slide the stud of the anti-rotation bracket into the slot in the
bottom of the actuator. Bend the strap as needed to support the rear of the actuator.
5. Fasten the strap to the duct with two screws. We recommend No. 8 self tapping sheet metal screws.
6. Loosen the two nuts on the universal clamp. Disengage the
actuator gear train by pressing the “manual override button”
(half round black button near the cable entry). Keeping the
gears disengaged, and the damper fully closed, rotate the
clamp until it is about 5° from the closed position or approximately 1/16 to 1/8 of an inch between the mechanical stop
and the universal clamp.
7. Tighten the two nuts on the clamp with an 10 mm wrench
(Belimo Tool-01). Use 4…6 ft-lb of torque.
Installation Instructions
®
General Wiring
General Wiring Instructions
WARNING The wiring technician must be trained and experienced with electronic circuits. Disconnect power supply before
attempting any wiring connections or changes. Make all connections in accordance with wiring diagrams and follow all
applicable local and national codes. Provide disconnect and
overload protection as required. Use copper, twisted pair,
conductors only. If using electrical conduit, the attachment
must be made with flexible conduit.
Maximum wire length:
Always read the controller manufacturer's installation literature carefully before making any connections. Follow all
instructions in this literature. If you have any questions, contact
the controller manufacturer and/or Belimo.
Wire Type and Wire Installation Tips
For most installations, 18 or 16 Ga. cable works well with the
NM24 type actuators. Use code approved wire nuts, terminal
strips or solderless connectors where wires are joined. It is
good practice to run control wires unspliced from the actuator
to the controller. If splices are unavoidable, make sure the
splice can be reached for possible maintenance. Tape and/or
wire tie the splice to reduce the possibility of the splice being
inadvertently pulled apart.
G20492-Subject to change. © Belimo Aircontrols (USA), Inc.
CAUTION: It is good practice to power electronic or digital controllers from a separate power transformer than that used for
actuators or other end devices. The power supply design in
our actuators and other end devices use half wave rectification.
Some controllers use full wave rectification. When these two
different types of power supplies are connected to the same
power transformer and the DC commons are connected together, a short circuit is created across one of the diodes in the full
wave power supply, damaging the controller. Only use a single
power transformer to power the controller and actuator if you
know the controller power supply uses half wave rectification.
Multiple actuators, one transformer
Multiple actuators may be powered from one transformer provided the following rules are followed:
1. The TOTAL current draw of the actuators (VA rating) is less
than or equal to the rating of the transformer.
2. Polarity on the secondary of the transformer is strictly followed. This means that all No. 1 wires from all actuators
are connected to the common leg on the transformer and all
No 2 wires from all actuators are connected to the hotleg.
Mixing wire No. 1 & 2 on one leg of the transformer will
result in erratic operation or failure of the actuator and or
controls.
Multiple actuators, multiple transformers
Multiple actuators positioned by the same control signal may be
powered from multiple transformers provided the following rules
are followed:
1. The transformers are properly sized.
2. All No. 1 wires from all actuators are tied together and tied
to the negative leg of the control signal. See wiring diagram.
Max. Feet.
2500 Ft.
1600 Ft.
1000 Ft.
Wire Size
18 Ga
20 Ga
22 Ga
Max. Feet
600 Ft.
350 Ft
175 Ft
Fig. 1
The NM24… proportional actuators have a digital circuit that is
designed to ignore most unwanted input signals (pickup). In
some situations the pickup may be severe enough to cause
erratic running of the actuator. For example, a large inductive
load (high voltage AC wires, motors, etc.) running near the
power or control wiring may cause excessive pickup. To solve
this problem, make one or more of the following changes:
1. Run the wire in metallic conduit.
2. Reroute the wiring away from the source of pickup.
3. Use shielded wire (Belden 8760 or equal). Ground the
shield to an earth ground. Do not connect it to the actuator
common.
Reversing switch, “L/R”
The NM24-/SR US actuators have a reversing switch on the
cover labeled “L/R”. With the switch in position “L”, the actuator rotates clockwise with an increase in voltage or current.
With the switch in Position “R”, the actuator rotates counterclockwise with an increase in voltage or current.
The NM24 US, on-off, tri-state actuators when set for switch
position “R”, rotate clockwise when power is applied to wire #3,
and counterclockwise when power is applied to wire #2.
During checkout, the switch position can be temporarily
reversed and the actuator will reverse its direction. This allows
the technician a fast and easy way to check the actuator operation without having to switch wires or change settings on the
thermostat. When the check-out is complete, make sure the
switch is placed back to its original position.
Wire length for NM type actuators
Keep power wire runs below the limits listed in the Fig. 1. If
more than one actuator is powered from the same wire run,
divide the allowable wire length by the number of actuators to
determine the maximum run to any single actuator.
Example: 3 actuators, 16 Ga wire
1000 Ft ÷ 3 Actuators = 333 Ft. Maximum wire run.
151
NM
Transformer(s)
The NM24 type actuator requires a 24 VAC class 2 transformer
and draws a maximum of 4 VA per actuator. The actuator
enclosure cannot be opened in the field, there are no parts or
components to be replaced or repaired.
– EMC directive: 89/336/EEC
– Software class A: Mode of operation type 1
– Low voltage directive: 73/23/EEC
Wire Size
12 Ga
14 Ga
16 Ga
Installation Instructions
®
Operational Information
Additional Operational Information for NM24-SR US and NM24-MFT US Proportional Actuators
Microprocessor controlled brushless DC motor
An on board microprocessor monitors operation and controls a
brushless DC motor. It also performs a self test upon power up.
Overload protection
The Belimo NM24-SR US actuator is protected from overload
at all angles of rotation. The on board microprocessor constantly monitors the rotation of the DC drive motor inside the
actuator and stops the pulses to the motor when it senses a
stall condition. The DC motor remains energized and produces
full rated torque to the load. This helps ensure that dampers
are fully closed and that edge and blade seals are always properly compressed.
Brushless DC motor operation
Belimo's brushless DC motor spins by reversing the poles of
stationary electromagnets housed inside rotating permanent
magnets. The electromagnetic poles are switched by a microprocessor and a special ASIC (Application Specific Integrated
Circuit) developed by Belimo. Unlike the conventional DC
motor, there are no brushes to wear or commutators to foul.
Motor position detection
Belimo Brushless DC motors do not use potentiometers for positioning. Inside the motor are three "Hall Effect" sensors. These
sensors detect the spinning rotor and send pulses to the microprocessor which counts the pulses and calculates the position.
Initialization or function check
When a power source is applied to terminal 1 and 2 the motor
carries out an initialization of the actuator. If required, a function
check can also be made after connection of the supply voltage
by pressing in the manual override button and then releasing it.
The purpose of this initialization is to determine the mechanical
angle of rotation and to adapt the running time to the angle of
rotation. The function check can also be used to verify that the
damper, and linkage (if mounted) are running free and are correctly adjusted.
The function check makes the motor run first to the clockwise
or counter-clockwise stop, depending on the selector switch
position. Thereafter it runs to the opposite stop. During this
operation the output (U5) supplies 2 VDC.
Re-initialization
Whenever the “manual override button” is pressed and
released and the actuator is powered, the microprocessor will
“re-initialize”. See “Initialization or function check” above.
Motor speed and run time
The microprocessor also controls the speed of the motor. In a
conventional DC motor, increased torque slows the motor
speed. Since the microprocessor determines the total rotation
during initialization, it can calculate how fast to turn the motor
to insure a 150 second run time independent of the total rotation over a range of 35-95°. Below 35°, the motor runs at a constant speed and the run time is proportional to the angle.
152
Input Resolution
During initialization the microprocessor determines the maximum rotation angle. It then divides this angle by the working
span of the input signal and calculates how many degrees to
travel for each volt change in control signal or pulse length.
This means that the working span (Example: 8 V for a 2 to 10
VDC Signal) is consistent for any angle of maximum rotation
down to as low as 35°. This greatly simplifies engineering and
checkout when dampers have differing maximum rotations.
Total Rotation
95°
75°
55°
Run Time
150 Sec.
150 Sec.
150 Sec.
Total Rotation
35°
15°
5°
Run Time
150 Sec.
64 Sec.
21 Sec.
Monitoring and self-adjustment of close-off position
The purpose of this function is to correct the mechanical tolerances within 4% which can change over time. It assures that
the actuator always presses the damper blade with maximum
pressure onto the seal. The end positions are automatically
checked as soon as the actuator position comes within 3% of
the total angle of rotation, at full open or full closed.
If the actuator registers a change of the end position of ≤ 4%,
the angle of rotation will be modified. If the actuator registers a
change of the end position > 4%, the actuator will consider it an
error and not modify the angle of rotation.
The actuator will self-adjust until it reaches its mechanical stops.
Initialization of NM…MFT US actuators
The non-spring return …MFT actuators must go through an initialization procedure to learn the zero signal position. When the power
is first applied to the actuator, or the gear release button is
depressed, the actuator will move to its zero signal position. After
the actuator learns this, it will drive to its control position.
Belimo brushless DC motors eliminate the need for potentiometers for positioning. Inside the motor are three “Hall Effect” sensors. These sensors detect the spinning rotor and send pulses
to the microprocessor which counts the pulses and calculates
the position to within 1/3 of a revolution of the motor.
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
Controller types
Belimo NM24-SR US actuator is compatible with virtually all
electronic controllers using a 2 to 10 VDC control signal. And
will work with a 4 to 20 mA signal with the addition of a 500Ω
resistor.
Installation Instructions
®
Control Accuracy and Stability
NM24-SR US actuators have built-in brushless DC motors which provide better accuracy and longer service life.
The NM24-SR US actuators are designed with a unique non-symmetrical deadband. The actuator follows an increasing or
decreasing control signal with a 70 mV resolution. If the signal changes in the opposite direction, the actuator will not respond
until the control signal changes by 70 mV. This allows these actuators to track even the slightest deviation very accurately, yet
allowing the actuator to “wait” for a much larger change in control signal due to control signal instability.
NM Actuator responds to a 70 mV signal
when not changing direction from stop
Satisfied
Control Position
NM Actuator responds to a 70 mV signal
when reversing direction from stop position.
Minimum Reversed
Control Deadband
Prior to Normal Control
70 mV
70 mV
Satisfied
Control Position
Minimum
Control Resolution
NM
The NM24-MFT US control accuracy and stability can be found in the MFT specifications, page 187.
G20492-Subject to change. © Belimo Aircontrols (USA), Inc.
Additional accessories
ZG-NMSA-1 Shaft adaptor
SGA24/SGF24
Used on 1/2" diameter shafts that are shorter than 3/4" and
mounting space is minimal.
Minimum and/or manual positioner (electronic), SGA24 is
enclosed in a NEMA 4 housing. The SGF24 is for flush panel
mounting.
SGF24
SGA24
AV 10-18 Shaft Extension
ZG-H2 Actuator Operator Handle
For damper shafts 3/8 to 11/16 in [9.5 mm to 18 mm] dia or 3/8
to 9/16 in [9.5 mm to 14 mm]
square.
Used when it is desirable to move or adjust damper by hand.
Increases leverage and precision during set-up and testing.
Dimensions
[All numbers in brackets are in millimeters.]
153
Startup and Checkout
®
Instructions For NM24-SR US and NM24-MFT US + P-100…
Step
Procedure
Expected Response
Actuator Responds
Go To Step ...
No Response
Go To Step
1.
Connect signal Input to wires 1 & 3.
Connect signal output (if used) to
wires 1 & 4
Connect 24 VAC/VDC power to
Wires 1 & 2
Actuator drives to the “No
Signal” position (usually closed),
then to the “Maximum Signal”
position (usually open) then to
the “Control Signal” position.
Actuator operates
properly
Step 9
No response at all
Step 2
Operation is
reversed
Step 3
Does not drive
toward "Control
Signal Position"
Step 4
2.
Check power wiring. Correct any
problems. Note 1
Power supply rating should be ≥
the total power requirement of
the actuator(s). Minimum voltage of 19.2 VAC or 21.6 VDC.
Power wiring corrected, actuator begins
to drive
Step 1
Power wiring
corrected, actuator
still does not drive
Step 8
3.
Turn reversing switch to the correct
position. Make sure the switch is
turned all the way left or right. Press
“Override Button” all the way down
and release
Actuator drives to the “No
Signal” position (usually closed),
then to the “Maximum Signal”
position (usually open) then to
the “Control Signal” position.
Actuator operates
properly
Step 9
Does not drive
toward “Control
Signal Position”
Step 4
4.
Make sure the control signal positive
(+) is connected to Wire No 3 and
control signal negative (-) is connected to wire No. 1. Most control problems are caused by reversing these
two wires. Verify that the reversing
switch is all the way CCW or CW.
Drives to “Control Signal” position
Actuator operates
properly
Step 9
Step 5
5.
Disconnect signal input from Wires
No. 1 & 3
Actuator drives to the “No
Signal” position
Step 6
Step 8
6.
Check input signal with a digital volt
meter (DVM). Make sure the input is
within the range of the actuator. For
NM24-SR this is 2 to 10 VDC or
4 to 20 mA (with 500Ω resistor).
Input voltage or current should
be ±1% of what controller's
adjustment or programming indicate.
Controller output
(actuator input) is
correct. Input
Polarity Correct.
Step 7
Reprogram, adjust
repair or replace
controller as needed.
Step 7
7.
Disconnect power from Wire No. 2.
Reconnect signal input to Wires No.
1 & 3.
Reconnect power to Wire No. 2
Actuator drives to the “No
Signal” position (usually closed),
then to the “Maximum Signal”
position (usually open) then to
the “Control Signal” position.
Actuator operates
properly
Step 9
Step 8
8.
Actuator does not drive
Defective actuator
9.
Actuator works properly. Test controller by following controller manufacturer's instructions.
Note 1
154
Replace actuator
Check that the transformer(s) are sized properly.
• If a common transformer is used, make sure that polarity is observed on the secondary. This means connect all No. 1
wires to one leg of the transformer and all No. 2 wires to the other leg of the transformer.
• If multiple transformers are used with one control signal, make sure all No. 1 wires are tied together and tied to control
signal negative (-).
• Controllers and actuators must have separate 24 VAC/VDC power sources.
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
NM24-SR US and NM24-MFT US + P-100… Electrical check-out procedure
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